I never asked for donations, so there's no official button.
But if you really insist, you can check this 'hidden' page: www.hwinfo.com/contact_donate.html
EDIT: DONATE BUTTONS ARE NOW LOCATED AT THE BOTTOM OF THE HOMEPAGE

(01-04-2015, 10:33 AM)situnrocks Wrote: Hello Martin. Hats off to your work but being a student I can't donate more than $5. Is that ok to pay this much ?
Please add a donate button so that members can notice that instead visiting here.